Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752282Ab0F0EVi (ORCPT ); Sun, 27 Jun 2010 00:21:38 -0400 Received: from sh.osrg.net ([192.16.179.4]:36943 "EHLO sh.osrg.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751612Ab0F0EVZ convert rfc822-to-8bit (ORCPT ); Sun, 27 Jun 2010 00:21:25 -0400 Date: Sun, 27 Jun 2010 13:20:45 +0900 To: mattst88@gmail.com Cc: fujita.tomonori@lab.ntt.co.jp, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, rth@twiddle.net, ink@jurassic.park.msu.ru, mcree@orcon.net.nz, jbarnes@virtuousgeek.org, linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, airlied@gmail.com, alexdeucher@gmail.com, jglisse@redhat.com Subject: Re: Problems with alpha/pci + radeon/ttm From: FUJITA Tomonori In-Reply-To: References: <20100622145805R.fujita.tomonori@lab.ntt.co.jp> Mime-Version: 1.0 Content-Type: Text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Message-Id: <20100627130717M.fujita.tomonori@lab.ntt.co.jp> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (sh.osrg.net [192.16.179.4]); Sun, 27 Jun 2010 13:20:49 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1724 Lines: 51 On Thu, 24 Jun 2010 10:53:52 -0400 Matt Turner wrote: > > Seems that the IOMMU can't find 128 pages. It's likely due to: > > > > - out of the IOMMU space (possibly someone doesn't free the IOMMU > > ?space). > > > > or > > > > - the mapping parameters (such as align) aren't appropriate so the > > ?IOMMU can't find space. > > > > > >> Is this the cause of the bug we're seeing in the report [1]? > >> > >> Anyone know what's going wrong here? > > > > > > I've attached a patch to print the debug info about the mapping > > parameters. > > > > > > diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c > > index d1dbd9a..17cf0d8 100644 > > --- a/arch/alpha/kernel/pci_iommu.c > > +++ b/arch/alpha/kernel/pci_iommu.c > > @@ -187,6 +187,10 @@ iommu_arena_alloc(struct device *dev, struct pci_iommu_arena *arena, long n, > > ? ? ? ?/* Search for N empty ptes */ > > ? ? ? ?ptes = arena->ptes; > > ? ? ? ?mask = max(align, arena->align_entry) - 1; > > + > > + ? ? ? printk("%s: %p, %p, %d, %ld, %lx, %u\n", __func__, dev, arena, arena->size, > > + ? ? ? ? ? ? ?n, mask, align); > > + > > ? ? ? ?p = iommu_arena_find_pages(dev, arena, n, mask); > > ? ? ? ?if (p < 0) { > > ? ? ? ? ? ? ? ?spin_unlock_irqrestore(&arena->lock, flags); > > Using this patch, I log the attached output. Your system has 1GB iommu address space. I guess that it's enough for KSM? The parameters in the log looks good. But you got this log before you started X? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/